GIMP - GIMP (/ ɡ ɪ m p / GHIMP; GNU Image Manipulation Program) is a free and open-source raster graphics editor used for image retouching and editing, free-form drawing, converting between different image formats, and more specialized tasks.. GIMP for Absolute Beginners: Jan Smith, Roman Joost - GIMP for Absolute Beginners gives us an easy way to use the power of GIMP, and enjoy digital photography and graphics without worrying about application features..